Sony Ericsson mini pro help?

Ive set it to GSM only so i just access my wifi at home, i connected it to the wifi server and it worked... for a while. Then instead of the wifi symbol, now there is an E, which sometimes changes to an H or a G. I just want to use wifi, how can i access this and keep it like that?

Also, under the wifi symbol it says disconnected? i try turning it off and on again but it still says the same even though i go back to network selection and my wifi server comes up...
 
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